Question

Radiations of intensity 0.5W/m^2 are striking a reflecting plate at an angle 30° with the plate . The pressure on the plate is

Answer 1

Given :

- Intensity of radiations = 0.5 W / m^2

- Angle at which radiations are striking to a reflecting surface = 30°

To find :

• The pressure on the plate

Solution :

• We know that, intensity is given by formula

$I = P \times v \:$

Where, P = pressure on the plate and v = speed of light

• P = I / v

= 0.5 W/m^2 / 3 × 10^8 m/s^2

= 0.166 × 10^-8 N/m^2

• Hence, Pressure on the plate is 0.166 × 10^-8 N/m^2

Answer 2

Answer:

Torque is the measure of the force that can cause an object to rotate about an axis. Hence, torque can be defined as the rotational equivalent of linear force. The point where the object rotates is called the axis of rotation. In physics, torque is simply the tendency of a force to turn or twist.